X-RAY RADIATION SOURCE AND X-RAY TUBE

摘要

In an X-ray radiation source, a counter wall made of alkali-containing glass, out of walls of a housing of an X-ray tube, is sandwiched between a filament and an electric field control electrode to each of which a negative high voltage is applied. This configuration prevents an electric field from being generated in the counter wall and thus suppresses precipitation of alkali ions from the glass. Therefore, it prevents change in potential relationship between electrodes at different potentials such as the filament, grid, and target and enables stable operation to be maintained, without occurrence of a trouble of failure in maintaining a desired X-ray amount.

主权项

1. An X-ray radiation source comprising:
an X-ray tube having a cathode to which a negative high voltage is applied, a target generating X-rays with incidence of electrons from the cathode, and a housing that houses the cathode and the target and having an output window to output the X-rays generated from the target, to the outside; and a power supply unit generating the negative high voltage to be applied to the cathode, wherein the housing has a window wall provided with the output window, and a main body portion joined to the window wall to form a housing space for housing the cathode and the target, wherein the main body portion has a counter wall arranged opposite to the window wall and made of alkali-containing glass, and wherein an electric field control electrode to which a negative high voltage substantially equal to the negative high voltage supplied to the cathode is applied from the power supply unit is arranged on an outer surface side of the counter wall.